The newly discovered world — a "sednoid" — challenges what planetary scientists thought they knew about the edge of the solar ...

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today ...

Nearly a month ago, a mysterious object was seen hurtling through the solar system and later confirmed as an interstellar ...

There’s a visitor in town, and its name is 3I/ATLAS. The presumed interstellar comet presents a rare opportunity for ...

International astronomers have for the first time witnessed the birth of a planetary system beyond Earth's sun that could one ...

Evidence that rocky planets beyond Jupiter formed as rapidly, and at the same time, as the inner planets could transform our ...

Images from two different telescopes give astronomers a glimpse at the formation of a "new" planetary system around a star ...

Astronomers have discovered an object at the edge of the solar system that is locked in a strange rhythmic dance with the ice ...

The solar system consists of eight planets, several dwarf planets, hundreds of moons, and billions of asteroids, comets and ...

A lone body, making one passage around the Sun for every ten by Neptune, is rewriting the rules of planetary dynamics in the ...

For Harold Kozak, one of life’s greatest pleasures is the opportunity to educate the public about the stars and the vast ...

Explore ten scientifically grounded facts about our solar system, from unique planetary features to surprising interplanetary ...